package com.qingluan.control;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class AES {
    /*
     * public static void main(String[] args){ String content =
     * "testsdfsdfsdfasdfasdfasdfasdfasdfadkjfkljviuoaijdflkjalskdjflakueslifjalksdfjkjdslfkjasldkjioaudgajelkfjlkasjdflkajiovuaoie"
     * ; String password = "12345678"; //加密 System.out.println("加密前：" +
     * content); byte[] encryptResult = encrypt(content, password); String
     * encryptResultStr = parseByte2HexStr(encryptResult);
     * System.out.println("加密后：" + encryptResultStr); //解密 byte[] decryptFrom =
     * parseHexStr2Byte(encryptResultStr); byte[] decryptResult =
     * decrypt(decryptFrom,password); System.out.println("解密后：" + new
     * String(decryptResult)); }
     */
    public byte[] result;
    private String de;
    public AES(String Data,String password) {
	
	System.out.println("加密前：" + Data);
	byte[] encryptResult = encrypt(Data, password);
	String encryptResultStr = parseByte2HexStr(encryptResult);
	System.out.println("加密后：" + encryptResultStr);
	byte[] decryptFrom = parseHexStr2Byte(encryptResultStr);
	byte[] decryptResult = decrypt(decryptFrom, password);
	result = decryptResult;
	de = encryptResultStr;
	System.out.println("解密后：" + new String(decryptResult));
    }

    /**
     * 取结果字符串
     * 
     * @param
     * @return result
     */
    public String[] getString(){
    	String en = new String(result);
    	
    	String[] some = {en ,de};
    	return  some;
    }
    /**
     * 取结果二进制
     * 
     * @param
     * @return result
     */
    public byte[] getByte(){
	return result;
    }
    /**
     * 将二进制转换成16进制
     * 
     * @param buf
     * @return
     */
    public static String parseByte2HexStr(byte buf[]) {
	StringBuffer sb = new StringBuffer();
	for (int i = 0; i < buf.length; i++) {
	    String hex = Integer.toHexString(buf[i] & 0xFF);
	    if (hex.length() == 1) {
		hex = '0' + hex;
	    }
	    sb.append(hex.toUpperCase());
	}
	return sb.toString();
    }

    /**
     * 将16进制转换为二进制
     * 
     * @param hexStr
     * @return
     */
    public static byte[] parseHexStr2Byte(String hexStr) {
	if (hexStr.length() < 1)
	    return null;
	byte[] result = new byte[hexStr.length() / 2];
	for (int i = 0; i < hexStr.length() / 2; i++) {
	    int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
	    int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2),
				       16);
	    result[i] = (byte) (high * 16 + low);
	}
	return result;
    }

    /**
     * 加密
     * 
     * @param content
     *            需要加密的内容
     * @param password
     *            加密密码
     * @return
     */
    public static byte[] encrypt(String content, String password) {
	try {
	    KeyGenerator kgen = KeyGenerator.getInstance("AES");
	    kgen.init(128, new SecureRandom(password.getBytes()));
	    SecretKey secretKey = kgen.generateKey();
	    byte[] enCodeFormat = secretKey.getEncoded();
	    SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
	    Cipher cipher = Cipher.getInstance("AES");// 创建密码器
	    byte[] byteContent = content.getBytes("utf-8");
	    cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
	    byte[] result = cipher.doFinal(byteContent);
	    return result; // 加密
	} catch (NoSuchAlgorithmException e) {
	    e.printStackTrace();
	} catch (NoSuchPaddingException e) {
	    e.printStackTrace();
	} catch (InvalidKeyException e) {
	    e.printStackTrace();
	} catch (UnsupportedEncodingException e) {
	    e.printStackTrace();
	} catch (IllegalBlockSizeException e) {
	    e.printStackTrace();
	} catch (BadPaddingException e) {
	    e.printStackTrace();
	}
	return null;
    }

    /**
     * 解密
     * 
     * @param content
     *            待解密内容
     * @param password
     *            解密密钥
     * @return
     */
    public static byte[] decrypt(byte[] content, String password) {
	try {
	    KeyGenerator kgen = KeyGenerator.getInstance("AES");
	    kgen.init(128, new SecureRandom(password.getBytes()));
	    SecretKey secretKey = kgen.generateKey();
	    byte[] enCodeFormat = secretKey.getEncoded();
	    SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
	    Cipher cipher = Cipher.getInstance("AES");// 创建密码器
	    cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
	    byte[] result = cipher.doFinal(content);
	    return result; // 加密
	} catch (NoSuchAlgorithmException e) {
	    e.printStackTrace();
	} catch (NoSuchPaddingException e) {
	    e.printStackTrace();
	} catch (InvalidKeyException e) {
	    e.printStackTrace();
	} catch (IllegalBlockSizeException e) {
	    e.printStackTrace();
	} catch (BadPaddingException e) {
	    e.printStackTrace();
	}
	return null;
    }
}